San Diego Climate by Month – Rainy Season, Temperature Averages
Summary
The climate figures for San Diego are averaged from 2016–2025 observations (10 years). Annual rainfall averages about 359 mm.
The rainy season runs –. The wettest month is January with 73.6 mm across 6 rain days; the driest is June at just 2.3 mm.
The hottest month is August (average high 25.4°C) and the coolest is January (17.4°C).
The most comfortable time to visit San Diego is June — less rain and milder heat.
Monthly averages · 2016–2025
| Monthly averages | High | Low | Rainfall | Rainy season |
|---|---|---|---|---|
| January | 17.4° | 8.7° | 74 mm | 6 |
| February | 17.9° | 8.9° | 56 mm | 5 |
| March | 17.7° | 10.3° | 64 mm | 9 |
| April | 19.6° | 12.3° | 21 mm | 3 |
| May | 20.0° | 14.1° | 13 mm | 3 |
| June | 22.2° | 15.9° | 2 mm | 1 |
| July | 24.4° | 18.2° | 3 mm | 0 |
| August | 25.4° | 18.9° | 8 mm | 1 |
| September | 25.2° | 18.1° | 14 mm | 1 |
| October | 23.9° | 15.1° | 14 mm | 2 |
| November | 21.1° | 11.6° | 36 mm | 4 |
| December | 18.2° | 9.3° | 56 mm | 5 |